Acute bacterial infections of the bone characteristically show which one of the following? a. Necrotic bone b. Prolonged clinical course c. Predominantly mononuclear cells d. Congested and thrombosed blood vessels e. Granulation tissue Answers: Acute osteomyelitis shows bacteria, polymorphonuclear leukocytes, and congested and thrombosed blood vessels. Its course is not prolonged, as is the course of chronic osteomyelitis. Necrotic bone, presence of granulation and fibrous tissues, very few bacteria, and the absence of living osteocytes characterize chronic osteomyelitis.